Doran W. Bloom, 27, entered the house of John and Audrey Feldkamp in the 7500 block of Somerset Drive around 8 p.m. Tuesday, according to authorities.

Their son, Scott Feldkamp, 54, saw Bloom attacking his 84-year-old father in the entryway of the house, Nygren said. At first, the son thought Bloom was punching his father, but as he approached, he saw that his father was being stabbed, Nygren said.

The son tried to intervene but was also stabbed, Nygren said. So he ran upstairs and grabbed a 9mm pistol, aimed over an upstairs banister and shot Bloom. Feldkamp discovered that his 81-year-old mother had also been stabbed. She was found to have been stabbed 14 times in the torso, Nygren said.

She later died at a Rockford hospital. Her husband and Bloom were dead at the scene. Scott Feldkamp was in fair condition at an Elgin hospital, officials there said. Police hoped to continue talking to him today, Nygren said.

Bloom used a 4-inch blade he brought to the home, Nygren said, and there were no signs of forced entry. Police have not discovered any motive for the killings, Nygren said.

Bloom’s mother, Susan Bloom, told police her son had been staying with the parents down the street from the Feldkamps’ house. Bloom said she saw her son in her backyard earlier Tuesday night. Around 8 p.m., she discovered her son had left the the backyard. She went outside to find him but all she saw were police cars at the Feldkamps' home.

Bloom earlier told the Tribune that police had given her little information about the deaths. "All I know is he’s dead and two people are dead," she said. "We’re waiting to hear what really happened."

Bloom’s mental fitness has been examined in the McHenry County courts.

After he was charged in October 2008 with stealing a bottle of Jack Daniel’s whiskey from a Marengo convenience store, his lawyer asked that his client be evaluated for fitness to stand trial, according to court records. A judge wrote that the lawyer had a “bona fide doubt” as to his client’s fitness.